|Born||14 September 1989|
|Height||1.78 m (5 ft 10 in)|
|Weight||80 kg (180 lb)|
|Club||Sydney Olympic Park Aquatic Centre|
Arnamnart completed at the 2006 Australian Short Course Swimming Championships reaching the finals of all three backstroke events. He finished 5th in 50 metres, 4th in the 200 metres and won the bronze medal in the 100 metre event finishing behind the winner in all three events Matt Welsh. On the back of these results he was named in the team of 30 to represent Australia at the second edition of the Junior Pan Pacific Swimming Championships held in Maui, Hawaii, in January 2007. At that event, he won the 100 metre backstroke in 54.99 seconds a new Under 17's Australian record. He also won two more gold medals when he teamed up Bobby Jovanovich, Robert Hurley and Reece Turner to take out the 4x100-metre freestyle relay and with James Stacey, Sam Ashby and Bobby Jovanovich to win the 4x100-metre medley relay. At the conclusion of the event, he was named the swimmer of the meet.
Daniel Arnamnart qualified for the 2012 Olympics by winning silver medal in the 100-metre backstroke at the Australian Swimming Championships in Adelaide with a time of 54.05.  At the 2012 Summer Olympics in London, Arnamnart competed in the preliminary heats of the 100-metre backstroke, and finished with the 16th-best time overall.
- "Recent Graduate Daniel Arnamnart" (pdf). Asquith Old Boys Club Newsletter 4: 2. March 2008. Retrieved 12 December 2011.
- "Jovanovich and Kates Named in 2007 Junior Pan Pacific Championships Team". Swimming WA. 31 August 2006. Retrieved 12 December 2011.
- "2007 Junior Pan Pacific Swimming Championships results" (pdf). 2006-2007 Swimming Australia Ltd Annual Report (Swimming Australia): 77. 2007. Retrieved 18 December 2011.
- "Australian Age records" (pdf). 2006-2007 Swimming Australia Ltd Annual Report (Swimming Australia): 99. 2007. Retrieved 18 December 2011.
- "Swimming Australia profile". Swimming Australia. Retrieved 18 December 2011.
- "Australian Olympic Team Profile". Australian Olympic Committee. Retrieved 11 April 2012.
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